Mastering TypeScript 3 - Third Edition

Express setup

In order to build an Express application, we will need to install Express in our development environment, as well as include the various declaration files that are needed for TypeScript compilation. Express can be installed using npm as follows:

npm init
npm install express --save  

Once Express has been installed, we will need the corresponding declaration files, as follows:

npm install @types/express --saveDev  

Express uses a series of other npm libraries whose declaration files are not included in the core express.d.ts declaration file. In order to allow for TypeScript compilation, we will need to install a few other declaration files as follows:

npm install @types/express-serve-static-core --saveDev
npm install @types/serve-static ...